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Related Concept Videos

Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
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Cytotoxic T Cells-mediated Immune Response01:27

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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Immune Surveillance by NK Cells and Phagocytes01:25

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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Related Experiment Video

Updated: Apr 23, 2026

Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
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Tissue-specific NK cell populations and their origin.

Tatyana Lysakova-Devine1, Cliona O'Farrelly2

  • 1Biomedical Diagnostics Institute, Dublin City University, Ireland; and.

Journal of Leukocyte Biology
|September 24, 2014
PubMed
Summary

Tissue-specific natural killer (NK) cells in organs like the gut and liver differ from blood NK cells. This review proposes they develop from local stem cells, offering new immunotherapy avenues.

Keywords:
hematopoietic progenitorsinnate immunitylymphoid cellsnatural killer cell progenitors

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Area of Science:

  • Immunology
  • Cell Biology
  • Hematology

Background:

  • Tissue-specific natural killer (NK) cell subpopulations exist in various adult organs, including the gut, liver, and endometrium.
  • These subpopulations exhibit distinct phenotypic and functional characteristics compared to peripheral blood NK (pbNK) cells.
  • The precise origin and developmental pathways of these tissue-resident NK cells remain a subject of scientific debate.

Purpose of the Study:

  • To review the current understanding of tissue-specific NK cell populations.
  • To propose a model for the in situ differentiation of NK cell subpopulations from local progenitors.
  • To highlight the potential implications for developing novel immunotherapies.

Main Methods:

  • Literature review of existing studies on NK cell biology and tissue residency.
  • Comparative analysis of phenotypic and functional data from tissue-specific and peripheral blood NK cells.
  • Hypothesizing developmental origins based on current immunological and stem cell research.

Main Results:

  • Tissue-specific NK cells display unique markers and functions, differentiating them from pbNK cells.
  • Evidence suggests these cells may originate from tissue-resident hematopoietic progenitor cells.
  • The differentiation process is proposed to occur in situ within specific organ microenvironments.

Conclusions:

  • Tissue-specific NK cells likely arise from local progenitor cells differentiating within their respective tissues.
  • Understanding the origins and maturation of these cells is crucial for targeted therapeutic strategies.
  • This knowledge could pave the way for new immunotherapies against organ-specific infectious and malignant diseases.